VERITAS Volume Manager 3.5 Administrator's Guide (September 2002)

Chapter 8, Administering Volumes
Removing a RAID-5 Log
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Adding a RAID-5 Log using vxplex
As an alternative to using vxassist, you can add a RAID-5 log using the vxplex
command. For example, to attach a RAID-5 log plex, r5log, to a RAID-5 volume, r5vol,
use the following command:
# vxplex att r5vol r5log
The attach operation can only proceed if the size of the new log is large enough to hold all
of the dataon thestripe. Ifthe RAID-5volume already contains logs, the new log length is
the minimum of each individual log length. This is because the new log is a mirror of the
old logs.
If the RAID-5 volume is not enabled, the new log is marked as BADLOG and is enabled
when the volume is started. However, the contents of the log are ignored.
If the RAID-5 volume is enabled and has other enabled RAID-5 logs, the new log’s
contents are synchronized with the other logs.
If the RAID-5 volume currently has no enabled logs, the new log is zeroed before it is
enabled.
Removing a RAID-5 Log
To identify the plex of the RAID-5 log, use the following command:
# vxprint -ht volume
where volume is the name of the RAID-5 volume. For a RAID-5 log, the output lists a plex
with a STATE field entry of LOG.
To dissociate and remove a RAID-5 log and any associated subdisks from an existing
volume, use the following command:
# vxplex -o rm dis plex
For example, to dissociate and remove the log plex volraid-02 from volraid, use the
following command:
# vxplex -o rm dis volraid-02
You can also remove a RAID-5 log with the vxassist command, as follows:
# vxassist remove log volume [nlog=n]
Use the optional attribute nlog=n to specify the number, n, of logs to be removed. By
default, the vxassist command removes one log.